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Hydra-jet slotting tool
| Details |
Inventors: Skinner, Neal G.; Braswell, Harry A.;
Assignee: Halliburton Company (Duncan, OK)
Primary Examiner: Pate, III; William F.
Assistant Examiner:
Attorney, Agent or Firm: Walkowski; Joseph A., Tregoning; John H.
The present invention relates to an apparatus for controlling the rate and extent of cutting slots in flow conductors, particularly casing in wells. The apparatus is hung in the well from a pipe string, locked in position, and force applied to the string. A hydraulic metering mechanism acts against the applied force to control the rate of travel of one or more jet bodies attached to the movable mandrel of the apparatus, the stroke of which determines the extent of the cut. |
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DETAILED DESCRIPTION We claim: 1.
Apparatus for controlling the rate of tool movement in a well casing, comprising: housing means having slip means thereon, said slip means adapted to engage said well casing; mandrel means longitudinally slidably disposed in said housing means; spring means adapted to bias said mandrel means against longitudinal movement; and metering means adapted to control the rate of longitudinal movement of said mandrel means with respect to said housing means.
2.
The apparatus of claim 1, wherein said slip means is selectively engageable with said well casing.
3.
The apparatus of claim 2, wherein said selective engagement of said slip means is controlled by J-slot means.
4.
The apparatus of claim 3, wherein said J-slot means comprises a J-slot in said housing means, a pin fixed at one end to said slip body means slidably mounted on said housing means, the free end of said pin disposed within said J-slot, said slip body having attached thereto said slip means.
5.
The apparatus of claim 1, further comprising annular wedge means surrounding said housing means longitudinally adjacent to said slip means, said slip means being biased radially outward by longitudinal contact with said wedge means.
6.
The apparatus of claim 1, wherein said mandrel means is adapted to connect to a pipe string.
7.
The apparatus of claim 1, wherein said metering means is hydraulic metering means.
8.
The apparatus of claim 7, wherein said hydraulic metering means meters fluid transfer between upper end lower chamber means.
9.
The apparatus of claim 8, wherein said upper chamber and said lower chamber are disposed between said mandrel means and said housing means.
10.
The apparatus of claim 9, wherein said hydraulic metering means further comprises metering cartridge means between said upper chamber and said lower chamber.
11.
The apparatus of claim 10, wherein said metering cartridge means possesses jet means to meter said fluid transfer between said upper and lower chambers, in a first direction, and check valve means to permit free flow of said fluid in a second, opposite direction
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